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• Sensor based vs. AABB based collision

  - by Hillel

  I'm trying to write a simple collision system, which will probably be primarily used for 2D platformers, and I've been planning out an AABB system for a few weeks now, which will work seamlessly with my grid data structure optimization. I picked AABB because I want a simple system, but I also want it to be perfect. Now, I've been hearing a lot lately about a different method to handle collision, using sensors, which are placed in the important parts of the entity. I understand it's a good way to handle slopes, better than AABB collision. The thing is, I can't find a basic explanation of how it works, let alone a comparison of it and the AABB method. If someone could explain it to me, or point me to a good tutorial, I'd very much appreciate it, and also a comparison of the advantages and disadvantages of the two techniques would be nice.

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• SEO Question - allintitle with or without quotes

  - by Aaron

  I'm trying to learn more about implementing basic SEO strategies and have been spending a lot of time refining my keywords using Google Analytics combined with manually checking them using Google's allintitle operator. However, I'm unclear on whether I should be using quotes with my allintitles. Example: allintitle: seo tips and tricks for beginners 191 results allintitle: "seo tips and tricks for beginners" 70 results My thought is that it would be more accurate to use it without quotes because that way you get a more well rounded idea of all those you are competing with. So, my question is does Google give more weight to exact matches in the title tag or does that not really matter? If someone searched for: seo tips and tricks for beginners, would they be more likely to see the ones that have that exact phrase in their title tag or does that not have any impact?

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• SQL Concatenate

  - by Bunch

  Concatenating output from a SELECT statement is a pretty basic thing to do in SQL. The main ways to perform this would be to use either the CONCAT() function, the || operator or the + operator. It really all depends on which version of SQL you are using. The following examples use T-SQL (MS SQL Server 2005) so it uses the + operator but other SQL versions have similar syntax. If you wanted to join two fields together for a full name: SELECT (lname + ', ' + fname) AS Name FROM tblCustomers To add some static text to a value: SELECT (lname + ' - SS') AS Name FROM tblPlayers WHERE PlayerPosition = 6 Or to select some text and an integer together: SELECT (lname + cast(playerNumber as varchar) AS Name FORM tblPlayers Technorati Tags: SQL

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• Why is 2^16 a "special" number?

  - by javamonkey79

  OK, I feel stupid asking this - but in Jeff's article: Getting the Interview Phone Screen Right and originally stated in the 5 essential phone screen questions: They shouldn't stare blankly at you when you ask with 2^16 is. It's a special number. They should know it. I've been a developer\software engineer\code monkey\whatever for a little while now, and I don't think I've ever come across this. I mean, I can certainly count binary values do basic operations on them, etc, etc. But I don't see what is "special" about this value.

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• Display monitor info via command line

  - by icyrock.com

  Is there a way to query monitor information from command line? For example, get monitor model, similar to e.g. what lspci does for graphic card info, or whether it's currently on or off, things like that. If possible, what kinds of basic information such as the above can be easily gathered? For example, is it possible to determine if monitor is in portrait or landscape position? Or if it has built-in speakers or not? Command line is the preference, but if there's a GUI method, I'd like to hear about it, too.

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• No idea of how to simulate car crashes

  - by user2332868

  I have a simple car game with all the basic collision detection and movement in Unity with C#. But when I was building the "engine" for the game I didn't include a detail I later decided to include. I want the possibility so that cars can get damaged and so that the model can change. For example the car looked like it was new and after a crash it looks like a wreck. Please help me by pointing to some resources or by telling me approximate ways of implementing this new feature. Thanks!

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• Next Week - OTN Virtual Developer Day - Fusion Development Experience

  - by Shay Shmeltzer

  Don't miss your chance to get free training on Oracle's strategic development platform including Oracle ADF and the rest of Fusion Middleware. On July 10th, we are running a virtual developer conference that you can attend directly from your desktop. We have sessions covering everything from basic ADF topics such as the Controller and ADF Faces to sessions about the latest news in the ADF world including ADF development with Eclipse using OEPE and ADF Mobile for iPhone and Android development. A special track will expose you to ADF connection to the rest of FMW including BPM, WebCenter and BI. During the sessions you'll be able to chat with the presenters, and you can also do a hands-on lab. So sign up today and join us on Tuesday.

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• HTTP Session Invalidation in Servlet/GlassFish

  - by reza_rahman

  HTTP session invalidation is something most of us take for granted and don't think much about. However for security and performance sensitive applications it is helpful to have at least a basic understanding of how it works in Servlets. In a brief code centric blog post Servlet specification lead Shing Wai Chan introduces the APIs for session invalidation and explains how you can fine tune the underlying reaper thread for session invalidation when it is needed in GlassFish 4. Don't hesitate to post a question here if the blog is not clear, this is a relatively esoteric topic...

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• What to choose for beginner: PHP/Python/Ruby

  - by Nai

  I'm a beginner teaching myself to code but I would like he insight of the PSE community and helping choose where to start. My main objective is to be able to create a basic website to first test my business idea and from there iterate on it quickly to minimise my learning time. The most important criteria for me is speed. An example of speed would be pre-built components available open source and not having to write one from scratch. From my research, this seems to be a death match between the following languages and frameworks: PHP and CakePHP Python and Django Ruby and Rails Assumptions: I am going to be equally good (or bad) in all 3. It is going to be equally easy to find competent developers in either language. I know this to be false already by lets assume that it is. This question is not meant to karma whore as I've seen how passionate some of these standoff questions have been and I'll be happy to turn it into a community wiki.

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• Simple 2D Flight Physics with Box2D

  - by MarkPowell

  I'm trying to build a simple side scroller with an airplane being the player. As such, I want to build simple flight controls with simple but realistic-feeling physics. I'm making use of cocos2D and Box2D. I have a basic system working, but just can't get the physics feeling correct. I am applying force to the plane (which is a b2CircleShape) based on the user's input. So, basically, if the user pushes up, body_->ApplyForce(b2Vec2(10,30), body_->GetPosition()) is called. Similarly, for down -30 is used. This works and the plane flys along with up/down causing it to dive or climb. But it just doesn't feel right. There is no slowdown on climbs, nor speed up during dives. My simple solution is far to simple. How can I get a better feel for a plane climbing/diving? Thanks!

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• building a website

  - by Ant

  A couple of my friends run a business and they asked me to build them a public website. It will only be used for information about the company with soe pictures. No transactions will be involved. Right now I work for a company where I build internal websites, and do alot of backend programming in C#. I understand html, css, jquery, etc. so I feel like I am completely capable of building a website for them. However, I do not know all the basic knowledge to building one. For example, where should we host the files, what type of security issues do I need to be aware of, what's the best software to use for developing websites (I use visual studio at work), where can I find some design techniques, etc. Any help is appreciated.

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• CNAME cross subdomain mapping problem

  - by Ron Ranieri

  I have the exact same problem as this but I don't understand the solution. I have 2 different domain name(with different hosting/provider) domain-one.com and domain-two.com which I want sub.domain-one.com to point to sub.domain-two.com using CNAME. All have been setup and propagate correctly but now when I go to sub.domain-one.com it goes to basic page of the server. If I go directly to sub.domain-two.com the page load correctly. I've tried to add the subdomain using Addon Domains on cPanel but the problem persist.

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• How to organize unit/integration test in BDD

  - by whatf

  So finally after reading a lot, I have understood that the difference between BDD and TDD is between T & B. But coming from basic TDD background, what I used to was, first write unittest for database models write test for views (at this point start with integration test as well, along with unittests) write more integration tests for testing UI stuff. What would be a correct way to approach BDD. Say I have a simple blog application. Given : When a user logs in. He should be shown list of all his posts. But for this, I need a model with a row user, another row blog posts. So how do we go about writing tests? when do we create fixtures? When do we write integration (selenium) tests?

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• What you do to restrict yourself from browsing internet unnecessarily?

  - by cod3-monk-3y

  I find myself browsing internet all the time and most of the time unnecessarily. I do find some interesting stuffs, learn something new daily. But I think most of the time I browse internet without any purpose. When I finish my basic tasks such as checking email, reading couple of news and browsing stackoverflow, I either go to Digg or Stumble through different sites and I find myself lost. I want to ask those who have gone through the similar situations. How do you restrict yourself from browsing internet unnecessarily?

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• SEO Benefits of adding a Tumblr feed to site

  - by Paul

  A client of ours has a CMS driven Blog in his hotel site - he would like to use the blog to add depth top his site and add seo benefits relating to the blogs content. The current blog is a basic header / text field and doesn't contain any tagging / meta features. Unfortunately we dont have a .net developer in our team to alter the existing blog and add meta / tagging and there isn't budget to hire one - so I considered using a Tumblr blog - setting it up externally - giving it a blog.hotelname.com address and feeding it into the existing page via tumblrs js - which basically does a document.write into the page - which we can style. I understand from a previous post (Poor CMS blog vs Tumblr embed as a general rule most search engines ignore JS created content - but will the above approach act as an improvement on the existing system for now - as the blog will be setup externally with its own url and also feed into the existing site? Cheers Paul

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• Android opengles 2.0 :different resolutions rendering and input

  - by kkan

  I'm currently developing a sprite based 2D game for android using opengles 2.0. I've got some basic rendering done that mimics the spritebatch functionality of xna (draw sprite, rotation, color). But all of this works for a fixed projection matrix, but android has a lot of screen sizes. Q1)Would this be an okay method to scale up/down the drawing? 1)Draw the whole screen to a texture. 2)Draw the above texture as a quad to the device. I found the above through some searching, not sure if it's the best one, are there any alternatives? Q2)How do you handle inputs for different resolutions? I currently get the position of a touch and use it raw. Would it be okay to get the position, and then scale the position to size of the texture used for rendering, and the perform calculations on it? Thanks.

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• How to edit files in a terminal with vim?

  - by andrew.46

  It is not always possible to edit and create files in a terminal and I would like to get the answers to the basics of manipulating files in a terminal using vim under Ubuntu Linux. Specific questions I have are: How can I open text files for editing? How can I save the file? How can I save the file with a different name? How can I leave the file without saving the changes? What settings are best in my configuration file and where is this file? How do I set the colors for vim? How do I show line numbers in vim and can this be toggled? A lot of questions here but I believe these questions and their answers should cover basic vim usage...

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• How to implement the setup rules like Clash of Clan?

  - by user25959

  Now I'm already implement the setup build rules which the building could move by unit grid width and height. But the validation detection is poor efficiency. The algorithm cost me 10~12(ms) in average when I move the building. Here is my approach to that: 1.Basic Grid, it is a two dimensional array. Grid[row][column], so that I can save info for each grid. Like whether is it in occupied or excluded. 2.Exclude Space, this is a space which limit same building numbers in space.

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• Programming Challenges for a beginner

  - by JMK

  I'm in an unusual situation. A colleague of mine wants to "learn programming" and, being a developer I have been tasked with teaching him "programming". Personally, I am self taught, and have never taught any sort of skill to anybody else before so I am not quite sure where to start. Also, I still have a heck of a lot to learn myself (although don't we all)! I write in C# but is C# a good language for a beginner? I was thinking that Visual Basic .Net would be a better starting point, so was considering getting him setup with Visual Studio Express 2010, teaching him a few basics (variables, functions, classes etc) then finding some programming challenges and asking him to work through these. Does anybody have a good source of these sorts of challenges? Also is this a good strategy? Finally, what are your experiences of teaching programming to somebody else and what advice would you give?

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• Tool Review: Telerik JustDecompile

  - by Sam Abraham

  In the next few lines, I will be providing a brief review of Telerik’s JustDecompile, a free .Net decompiler and assembly browser. In using Telerik’s 2012 Q3 JustDecompile release, one can see many great features.  First off, I loved the built-in options for loading .Net assemblies automatically using the Open->Load Framework menu option. Other options enable loading assemblies from GAC, XAP URL or locally from disk. The ability to create an “Assembly List” is quiet handy for grouping and saving a “List” of DLLs to load. All loaded assemblies are shown in the left panel of a split-panel screen. Clicking an assembly expands all namespaces within. Drilling further to class level displays the actual source code in the right panel in either IL, C# or Visual Basic. In conclusion, JustDecompile has grown and quickly matured into an indispensible handy tool for us developers. Telerik’s effort in maintaining and updating JustDecompile as well as the company’s commitment to keeping it free is much appreciated and valued.

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• What are deferred callbacks?

  - by tentimes

  I understand the idea of a callback, where I pass a function into another function and that function then uses the supplied function at will. I am struggling to understand deferred callbacks, even after googling it. Could someone provide a simple explanation please? I program in Ruby, but also know C/C++ a bit, but most of all I was a experienced assembly language programmer. So I am wondering is it a bit like a stack of callback addresses that get pop'd? I am hoping to learn jquery or node.js and these deferred callbacks seem integral to both. I understand basic threading principles (though mutex object makes my head hurt ;)

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• Texture not drawing on cubes

  - by Christian Frantz

  I can draw the cubes fine but they are just solid black besides the occasional lighting that goes on. The basic effect is being set for each cube also. public void Draw(BasicEffect effect) { foreach (EffectPass pass in effect.CurrentTechnique.Passes) { pass.Apply(); device.SetVertexBuffer(vertexBuffer); device.Indices = indexBuffer; device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 8, 0, 12); } } The cubes draw method. TextureEnabled is set to true in my main draw method. My texture is also loading fine. public Cube(GraphicsDevice graphicsDevice, Vector3 Position, Texture2D Texture) { device = graphicsDevice; texture = Texture; cubePosition = Position; effect = new BasicEffect(device); } The constructor seems fine too. Could this be caused by the Vector2's of my VertexPositionNormalTexture? Even if they were out of order something should still be drawn other than a black cube

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• Cloud Deployment Models

  - by B R Clouse

  Normal 0 false false false EN-US X-NONE X-NONE As the cloud paradigm grows in depth and breadth, more readers are approaching the topic for the first time, or from a new perspective.  This blog is a basic review of  cloud deployment models, to help orient newcomers and neophytes. Most cloud deployments today are either private or public. It is also possible to connect a private cloud and a public cloud to form a hybrid cloud. A private cloud is for the exclusive use of an organization. Enterprises, universities and government agencies throughout the world are using private clouds. Some have designed, built and now manage their private clouds. Others use a private cloud that was built by and is now managed by a provider, hosted either onsite or at the provider’s datacenter. Because private clouds are for exclusive use, they are usually the option chosen by organizations with concerns about data security and guaranteed performance. Public clouds are open to anyone with an Internet connection. Because they require no capital investment from their users, they are particularly attractive to companies with limited resources in less regulated environments and for temporary workloads such as development and test environments. Public clouds offer a range of products, from end-user software packages to more basic services such as databases or operating environments. Public clouds may also offer cloud services such as a disaster recovery for a private cloud, or the ability to “cloudburst” a temporary workload spike from a private cloud to a public cloud. These are examples of a hybrid cloud. These are most feasible when the private and public clouds are built with similar technologies. Usually people think of a public cloud in terms of a user role, e.g., “Which public cloud should I consider using?” But someone needs to own and manage that public cloud. The company who owns and operates a public cloud is known as a public cloud provider. Oracle Database Cloud Service, Amazon RDS, database.com and Savvis Symphony Database are examples of public cloud database services. Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} When evaluating deployment models, be aware that you can use any or all of the available options. Some workloads may be best-suited for a private cloud, some for a public or hybrid cloud. And you might deploy multiple private clouds in your organization. If you are going to combine multiple clouds, then you want to make sure that each cloud is based on a consistent technology portfolio and architecture. This simplifies management and gives you the greatest flexibility in moving resources and workloads among your different clouds. Oracle’s portfolio of cloud products and services enables both deployment models. Oracle can manage either model. Universities, government agencies and companies in all types of business everywhere in the world are using clouds built with the Oracle portfolio. By employing a consistent portfolio, these customers are able to run all of their workloads – from test and development to the most mission-critical -- in a consistent manner: One Enterprise Cloud, powered by Oracle.   /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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• Do I need to notify a user if I am using statistics software in an iPhone app?

  - by Chris

  Hello, I am currently creating a (very simple) Objective-C client to send basic statistical data to my server for an iPhone app - just things like the state of the app (first-launch or launch, error, etc), along with the make/model/version (i.e.: "iPod touch 4.2"). No personally identifiable information or location data is sent. Is there anything, in the Apple Developer agreement or otherwise, that states that I must notify the user if I am doing this? I'm not interested in selling the data or anything, I just want to use the data to make my apps better. I am not adverse to telling the user I am doing this if it is required, I just don't want to scare the users (the paranoid "oooh, they're tracking me, they know exactly where I am" crowd) if I don't have to. Thanks for any advice.

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• Why doesn't light continuous on my model?

  - by nosferat

  I created a basic textured cube model with Blender to practice modeling, and then I imported it into Unity. After I put up some lighting it looks pretty ugly. The light is not continuous on a row of textured cubes: What is more odd, the light on the blocks that makes up the floor is continuous. What am I doing wrong? UPDATE This is how it looks like without textures: https://dl.dropbox.com/u/45620018/without%20textures.PNG If I would not know that these are perfect cubes, I'd say there is a slight curve on surface. I also tried lightening the texture but it also didn't help: https://dl.dropbox.com/u/45620018/lighter%20texture.PNG I just simply exported the model from Blender and did not set up any normals or things like that. However I also did not do any special woth the floor brick model.

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